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1uDvB0qgeAePj2pNqJk8kisoFhKL5gXS6oLBHRF6jLQluJ2QRzaJynntpeqSfc7FP7BhQhQFkwvBrq3sc7+RGgiJOxOKmH07f0H+7GvOnfV14LpHFh8rZzpfhrs6ha/+f7Ws68lW8Rh7OXFdPDOd5ztl5LwTP+uDLZQNI6s2/dXQPqGNzvvcS6Af45iqiSX61+B1Iq14nLLXdewNmjnvDrqX6tboz1fwqE+5G8W9H18dAfxckAeknBsqfCLLliasJU7ygwqovPpqismeCUJMlyYZ1+YAEDI/c5wkPutPmy2bNFCbTZrvTMJMyR6/hCeRqn8pOQwGSf7K2S2q/J2Q6MwaKNsVluWrhezLg2k6loD2M6yQPxWJg6fpzF0AYe5J42EV6uCoAOq0EGmKJcVkOp0d15g6lB9W2RAYMxVbNpsiS7wxHNPqPdfmGVB4x24VSzk2/ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Sep 8, 2026 at 11:16 AM EDT, Tal Zussman wrote: > The swap entry of each new folio in __split_folio_to_order() is > computed by hand from folio->swap rather than with folio_swap_entry(), > because the folio's page count is not valid while it is being split. > Add a comment explaining this. > > Signed-off-by: Tal Zussman > --- > mm/huge_memory.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index d1ce061601bc..1fabdcbd8c8f 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -3763,6 +3763,10 @@ static void __split_folio_to_order(struct folio *f= olio, int old_order, > */ > VM_WARN_ON_ONCE_PAGE(new_folio->private, new_head); > =20 > + /* > + * Not all folio fields are valid during a split, so open-code > + * the swap entry rather than using folio_swap_entry(). > + */ > if (folio_test_swapcache(folio)) > new_folio->swap.val =3D folio->swap.val + i; > =20 LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi